mempool: move errors to be public (#6613)

## Description

Move mempool errors to be public, this is used in handling abci error codes

internal/mempool/v0/clist_mempool.go

@@ -14,6 +14,7 @@ import (
 	"github.com/tendermint/tendermint/internal/mempool"
 	"github.com/tendermint/tendermint/libs/log"
 	tmmath "github.com/tendermint/tendermint/libs/math"
+	pubmempool "github.com/tendermint/tendermint/pkg/mempool"
 	"github.com/tendermint/tendermint/proxy"
 	"github.com/tendermint/tendermint/types"
 )
@@ -216,7 +217,7 @@ func (mem *CListMempool) CheckTx(
 	}
 
 	if txSize > mem.config.MaxTxBytes {
-		return mempool.ErrTxTooLarge{
+		return pubmempool.ErrTxTooLarge{
 			Max:    mem.config.MaxTxBytes,
 			Actual: txSize,
 		}
@@ -224,7 +225,7 @@ func (mem *CListMempool) CheckTx(
 
 	if mem.preCheck != nil {
 		if err := mem.preCheck(tx); err != nil {
-			return mempool.ErrPreCheck{
+			return pubmempool.ErrPreCheck{
 				Reason: err,
 			}
 		}
@@ -247,7 +248,7 @@ func (mem *CListMempool) CheckTx(
 			// its non-trivial since invalid txs can become valid,
 			// but they can spam the same tx with little cost to them atm.
 			if loaded {
-				return mempool.ErrTxInCache
+				return pubmempool.ErrTxInCache
 			}
 		}
 
@@ -363,7 +364,7 @@ func (mem *CListMempool) isFull(txSize int) error {
 	)
 
 	if memSize >= mem.config.Size || int64(txSize)+txsBytes > mem.config.MaxTxsBytes {
-		return mempool.ErrMempoolIsFull{
+		return pubmempool.ErrMempoolIsFull{
 			NumTxs:      memSize,
 			MaxTxs:      mem.config.Size,
 			TxsBytes:    txsBytes,

internal/mempool/v0/clist_mempool_test.go

@@ -24,6 +24,7 @@ import (
 	"github.com/tendermint/tendermint/libs/log"
 	tmrand "github.com/tendermint/tendermint/libs/rand"
 	"github.com/tendermint/tendermint/libs/service"
+	pubmempool "github.com/tendermint/tendermint/pkg/mempool"
 	"github.com/tendermint/tendermint/proxy"
 	"github.com/tendermint/tendermint/types"
 )
@@ -82,7 +83,7 @@ func checkTxs(t *testing.T, mp mempool.Mempool, count int, peerID uint16) types.
 			// Skip invalid txs.
 			// TestMempoolFilters will fail otherwise. It asserts a number of txs
 			// returned.
-			if mempool.IsPreCheckError(err) {
+			if pubmempool.IsPreCheckError(err) {
 				continue
 			}
 			t.Fatalf("CheckTx failed: %v while checking #%d tx", err, i)
@@ -455,7 +456,7 @@ func TestMempool_CheckTxChecksTxSize(t *testing.T) {
 		if !testCase.err {
 			require.NoError(t, err, caseString)
 		} else {
-			require.Equal(t, err, mempool.ErrTxTooLarge{
+			require.Equal(t, err, pubmempool.ErrTxTooLarge{
 				Max:    maxTxSize,
 				Actual: testCase.len,
 			}, caseString)
@@ -503,7 +504,7 @@ func TestMempoolTxsBytes(t *testing.T) {
 
 	err = mp.CheckTx(context.Background(), []byte{0x05}, nil, mempool.TxInfo{})
 	if assert.Error(t, err) {
-		assert.IsType(t, mempool.ErrMempoolIsFull{}, err)
+		assert.IsType(t, pubmempool.ErrMempoolIsFull{}, err)
 	}
 
 	// 6. zero after tx is rechecked and removed due to not being valid anymore

internal/mempool/v1/mempool.go

@@ -14,6 +14,7 @@ import (
 	"github.com/tendermint/tendermint/internal/mempool"
 	"github.com/tendermint/tendermint/libs/log"
 	tmmath "github.com/tendermint/tendermint/libs/math"
+	pubmempool "github.com/tendermint/tendermint/pkg/mempool"
 	"github.com/tendermint/tendermint/proxy"
 	"github.com/tendermint/tendermint/types"
 )
@@ -224,7 +225,7 @@ func (txmp *TxMempool) CheckTx(
 
 	txSize := len(tx)
 	if txSize > txmp.config.MaxTxBytes {
-		return mempool.ErrTxTooLarge{
+		return pubmempool.ErrTxTooLarge{
 			Max:    txmp.config.MaxTxBytes,
 			Actual: txSize,
 		}
@@ -232,7 +233,7 @@ func (txmp *TxMempool) CheckTx(
 
 	if txmp.preCheck != nil {
 		if err := txmp.preCheck(tx); err != nil {
-			return mempool.ErrPreCheck{
+			return pubmempool.ErrPreCheck{
 				Reason: err,
 			}
 		}
@@ -252,7 +253,7 @@ func (txmp *TxMempool) CheckTx(
 		if wtx != nil && ok {
 			// We already have the transaction stored and the we've already seen this
 			// transaction from txInfo.SenderID.
-			return mempool.ErrTxInCache
+			return pubmempool.ErrTxInCache
 		}
 
 		txmp.logger.Debug("tx exists already in cache", "tx_hash", tx.Hash())
@@ -707,7 +708,7 @@ func (txmp *TxMempool) canAddTx(wtx *WrappedTx) error {
 	)
 
 	if numTxs >= txmp.config.Size || int64(wtx.Size())+sizeBytes > txmp.config.MaxTxsBytes {
-		return mempool.ErrMempoolIsFull{
+		return pubmempool.ErrMempoolIsFull{
 			NumTxs:      numTxs,
 			MaxTxs:      txmp.config.Size,
 			TxsBytes:    sizeBytes,